8281 · 21217616 + 1
At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly. This list is the most important PrimePages database: a collection of research, records and results all about prime numbers. This page summarizes our information about one of these primes.
This prime's information:
|Description:||8281 · 21217616 + 1|
|Verification status (*):||Proven|
|Official Comment (*):||Generalized Fermat|
|Proof-code(s): (*):||L2521 : Matillek, PSieve, Srsieve, PrimeGrid, LLR|
|Decimal Digits:||366543 (log10 is 366542.85728318)|
|Rank (*):||15330 (digit rank is 1)|
|Entrance Rank (*):||3212|
|Currently on list? (*):||no|
|Submitted:||2/12/2014 15:39:53 CDT|
|Last modified:||2/12/2014 19:22:10 CDT|
|Removed (*):||1/23/2015 19:10:56 CDT|
|Score (*):||43.5511 (normalized score 0.3434)|
There are certain forms classed as archivable: these prime may (at times) remain on this list even if they do not make the Top 5000 proper. Such primes are tracked with archival tags.
The Top 5000 Primes is a list for proven primes only. In order to maintain the integrity of this list, we seek to verify the primality of all submissions. We are currently unable to check all proofs (ECPP, KP, ...), but we will at least trial divide and PRP check every entry before it is included in the list.
field value prime_id 117143 person_id 9 machine WinXP Dual Core 2.6GHz 64-bit Laptop what prime notes Command: pfgw64.exe -t -q"8281*2^1217616+1" 2>&1 PFGW Version 188.8.131.52BIT.20130210.Win_Dev [GWNUM 27.8] Primality testing 8281*2^1217616+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 8281*2^1217616+1 is prime! (2097.2804s+0.0102s) [Elapsed time: 2098 seconds] modified 2020-07-07 17:30:18 created 2014-02-12 18:30:43 id 162664